Two types of interaction were studied. The first concerned interactions
between the earthworms (P. corethrurus) and H. sacchari
cysts, while the second involved direct interactions between the
earthworms (especially their guts) and the infesting nematodes
larvae (J2 stage). Due to problems encountered during the laboratory
rearing of P. zeae, it was not possible to study interactions
between P. corethrurus gut and P. zeae nematodes.